24V battery, 2.4kW inverter, so at least 125A, next size is 175A and as it turns out that is what the battery uses. You can buy them from bigbattery too.
I bought two 1.5 kWh Battery Evo units. A cable with SB175 to ring connector was included. It looks like the same cable from BigBattery for $12.95 The BigBattery series connector cable is $29.95 plus $10 shipping and sales tax.